SIST EN 50122-1:2011
(Main)Railway applications - Fixed installations - Electrical safety, earthing and bonding - Part 1: Protective provisions against electric shock
Railway applications - Fixed installations - Electrical safety, earthing and bonding - Part 1: Protective provisions against electric shock
This European Standard specifies requirements for the protective provisions relating to electrical safety in fixed installations associated with a.c. and/or d.c. traction systems and to any installations that can be endangered by the traction power supply system. It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during maintenance work within electric traction systems. This European Standard applies to all new lines and to all major revisions to existing lines for the following electric traction systems: a) railways; b) guided mass transport systems such as 1) tramways, 2) elevated and underground railways, 3) mountain railways, 4) trolleybus systems, and 5) magnetically levitated systems, which use a contact line system, c) material transportation systems. This European Standard does not apply to: d) mine traction systems in underground mines; e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the traction power supply system; f) suspended cable cars; g) funicular railways. This European Standard does not specify working rules for maintenance.
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und Rückstromführung - Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
Applications ferroviaires - Installations fixes - Sécurité électrique, dispositions pour les courants de retour et mise à la terre - Partie 1: Mesures de protection contres les chocs électriques
Železniške naprave - Stabilne naprave električne vleke - Električna varnost, ozemljitev in povezovanje - 1. del: Zaščitni ukrepi proti električnemu udaru
Ta evropski standard določa zahteve za zaščitne ukrepe v zvezi z električno varnostjo pri stabilnih napravah električne vleke na izmenični in/ali enosmerni tok in pri vseh inštalacijah, ki jih lahko ogroža napajanje sistema za vleko. Velja tudi za vse vidike stabilnih naprav, potrebnih za zagotavljanje električne varnosti med vzdrževalnim delom v električnih sistemih vleke. Ta evropski standard velja za vse nove vode in za vse večje prenove obstoječih vodov za naslednje električne sisteme vleke: a) železnice; b) vodene sisteme množičnega prevoza, kot so 1) tramvajske proge, 2) nadzemne in podzemne železnice, 3) gorske železnice, 4) trolejbusni sistemi in 5) sistemi z magnetnim lebdenjem, ki uporabljajo sistem voznih vodov, c) sisteme za prevoz materiala. Ta evropski standard ne velja za: d) rudniške vlečne sisteme v podzemnih rudnikih; e) žerjave, prenosne platforme in podobno opremo za prevoz po tirih, začasne strukture (npr. razstavne strukture), če niso napajane neposredno ali preko transformatorjev s sistema voznih vodov in jih ne ogroža napajanje sistema za vleko; f) viseče kabinske žičnice; g) vzpenjače. Ta evropski standard ne določa delovnih pravil za vzdrževanje.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50122-1:2011
01-september-2011
1DGRPHãþD
SIST EN 50122-1:1998
äHOH]QLãNHQDSUDYH6WDELOQHQDSUDYHHOHNWULþQHYOHNH(OHNWULþQDYDUQRVW
R]HPOMLWHYLQSRYH]RYDQMHGHO =DãþLWQLXNUHSLSURWLHOHNWULþQHPXXGDUX
Railway applications - Fixed installations - Electrical safety, earthing and bonding - Part
1: Protective provisions against electric shock
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und
Rückstromführung - Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
Applications ferroviaires - Installations fixes - Sécurité électrique, dispositions pour les
courants de retour et mise à la terre - Partie 1: Mesures de protection contres les chocs
électriques
Ta slovenski standard je istoveten z: EN 50122-1:2011
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
29.280 (OHNWULþQDYOHþQDRSUHPD Electric traction equipment
SIST EN 50122-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50122-1:2011
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SIST EN 50122-1:2011
EUROPEAN STANDARD
EN 50122-1
NORME EUROPÉENNE
January 2011
EUROPÄISCHE NORM
ICS 29.280 Supersedes EN 50122-1:1997
English version
Railway applications -
Fixed installations -
Electrical safety, earthing and the return circuit -
Part 1: Protective provisions against electric shock
Applications ferroviaires - Bahnanwendungen -
Installations fixes - Ortsfeste Anlagen -
Sécurité électrique, mise à la terre et Elektrische Sicherheit, Erdung und
circuit de retour - Rückleitung -
Partie 1: Mesures de protection contre les Teil 1: Schutzmaßnahmen gegen
chocs électriques elektrischen Schlag
This European Standard was approved by CENELEC on 2010-11-16. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50122-1:2011 E
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SIST EN 50122-1:2011
EN 50122-1:2011 – 2 –
Foreword
This European Standard was prepared by SC 9XC, Electric supply and earthing systems for public transport
equipment and ancillary apparatus (Fixed installations), of Technical Committee CENELEC TC 9X, Electrical
and electronic applications for railways. It was submitted to the formal vote and was approved by CENELEC
as EN 50122-1 on 2010-11-16.
This document supersedes EN 50122-1:1997.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-11-16
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-11-16
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of
EC Directives 96/48/EC (HSR), 2001/16/EC (CONRAIL) and 2008/57/EC (RAIL). See Annex ZZ.
__________
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SIST EN 50122-1:2011
– 3 – EN 50122-1:2011
Contents
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
3.1 Electrical safety and hazards . 8
3.2 Earthing and equipotential bonding . 10
3.3 Return circuit . 11
3.4 Electric traction system . 13
3.5 Contact line . 14
3.6 Corrosion and corrosion protection . 16
3.7 Current collection . 16
3.8 Residual current devices . 16
3.9 General terms. 17
4 Contact line zone and current collector zone . 17
4.1 Overhead contact line systems . 17
4.2 Conductor rail systems . 20
4.3 Trolleybus systems . 20
5 Protective provisions against direct contact . 22
5.1 General . 22
5.2 Protection by clearance . 22
5.3 Protection by obstacles . 25
5.4 Protective provisions for working under live conditions . 33
5.5 Specific protective provisions against electric shock in conductor rail systems . 36
5.6 Specific protective provisions against electric shock in systems in which the wheels of
the vehicles are not used for return circuit . 40
6 Protective provisions against indirect contact and impermissible rail potential . 41
6.1 Protective provisions against indirect contact . 41
6.2 Protective provisions for exposed conductive parts within the contact line zone or the
current collector zone . 42
6.3 Protective provisions for wholly or partly conductive structures . 43
6.4 Limitation of rail potentials . 45
7 Protective provisions for low voltage non traction power supplies . 45
7.1 General . 45
7.2 Related provisions . 46
7.3 Protective provisions for electrical installations in the overhead contact line zone or the
current collector zone . 46
7.4 Protective provisions for installations which are endangered by the traction power
supply return circuit . 46
8 Protective provisions where track systems, which are utilized for carrying traction
return current, or/and contact line systems pass through hazardous zones . 52
8.1 General . 52
8.2 Equipotential bonding . 53
8.3 Parallel pipework . 53
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SIST EN 50122-1:2011
EN 50122-1:2011 – 4 –
8.4 Insulating joints. 53
8.5 Surge arrester . 54
8.6 Contact line of loading sidings . 54
9 Limits for touch voltage and protection against the danger of rail potential . 54
9.1 General . 54
9.2 A.C. traction systems . 55
9.3 D.C. traction systems . 59
10 Additional protective provisions . 61
10.1 Traction substations and traction switching stations . 61
10.2 Cables . 61
10.3 Return circuit connections and earthing conductors . 61
10.4 Removing of decommissioned overhead contact lines . 62
10.5 Means of achieving safe isolation between sections . 63
Annex A (informative) Typical obstacles . 64
Annex B (normative) Warning sign . 66
Annex C (informative) Guiding values for rail potential gradient . 67
C.1 A.C. traction systems . 67
C.2 D.C. traction systems . 68
Annex D (informative) Effective touch voltage and body voltage with respect to the body
current . 69
D.1 Preconditions for the calculation . 69
D.2 Impedances . 69
D.3 Body current and related body voltage . 72
Annex E (normative) Measurement methods for effective touch voltages . 75
Annex F (normative) The use of voltage-limiting devices . 76
F.1 General . 76
F.2 Types . 76
F.3 Technical requirements . 76
Annex G (normative) Special national conditions . 77
Annex H (normative) A-deviations . 80
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives. 80
Bibliography . 81
Figures
Figure 1 — Overhead contact line zone and current collector zone . 19
Figure 2 — Overhead contact line zone and current collector zone for trolley bus systems . 21
Figure 3 — Minimum clearances to accessible live parts on the outside of vehicles as well as to live
parts of overhead contact line systems from standing surfaces accessible to persons for low
voltages. 23
Figure 4 — Minimum clearances to accessible live parts on the outside of vehicles as well as to live
parts of overhead contact line systems from standing surfaces accessible to persons for high
voltages. 23
Figure 5 — Standing surfaces for persons providing access to live parts on the outside of vehicles
and to overhead contact line systems . 25
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SIST EN 50122-1:2011
– 5 – EN 50122-1:2011
Figure 6 — Standing surfaces for persons providing access to live parts on the outside of vehicles
and to conductor rail systems . 26
Figure 7 — Examples of obstacles for standing surfaces in public areas for protection against direct
contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact line
system. 27
Figure 8 — Examples of obstacles for standing surfaces in restricted areas for protection against
direct contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact
line system for low voltages . 30
Figure 9 — Examples of obstacles for standing surfaces in restricted areas for protection against
direct contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact
line system for high voltages . 31
Figure 10 — Examples of obstacles for standing surfaces in restricted areas for protection against
direct contact when above live parts on the outside of vehicles or live parts of a contact line system
for low voltage . 32
Figure 11 — Examples of obstacles for standing surfaces in restricted areas for protection against
direct contact when above live parts on the outside of vehicles or live parts of an overhead contact
line system for high voltage . 33
Figure 12 — Example of an insulated obstacle beneath a structure . 34
Figure 13 — Example of an insulated obstacle beneath a structure for an unearthed trolley bus
system. 35
Figure 14 — Example of an insulated obstacle beneath a structure for a trolley bus system in which
the negative contact wire is earthed or connected to the return circuit of a tramway system . 36
Figure 15 — Public level crossing, private level crossing . 37
Figure 16 — Trackside structures . 38
Figure 17 — Signal-post with telephone. 39
Figure 18 — Authorized trackside walking route . 39
Figure 19 — Railway controlled crossing (depots, goods yard, station crossing) . 40
Figure 20 — TT system for a.c. railways . 49
Figure 21 — TN system for a.c. railways . 50
Figure 22 — TT system for d.c. railways . 51
Figure 23 — TN system for d.c. railways . 52
Figure 24 — Disposition of rail-to-rail cross bonds and track-to-track cross bonds (double-rail
illustration) and connection of the contact line in case of the loading siding having a contact line . 53
Figure 25 — Location of a surge arrester outside the overhead contact line zone of a loading siding
if there is a possibility of flashovers of the insulating pieces through lightning strikes . 54
Figure 26 — Design of return circuit, with regard to permissible effective touch voltage by checking
the rail potential or the effective touch voltage . 58
Figure A.1 — Examples of obstacles along the sides of standing surfaces in public areas for
protection against direct contact when above live parts on the outside of vehicles or live parts of an
overhead contact line system for low voltages (see 5.3.2.2). 64
Figure A.2 — Examples of obstacles along the sides of standing surfaces in public areas for
protection against direct contact when above live parts on the outside of vehicles or live parts of an
overhead contact line system for high voltages (see 5.3.2.2) . 65
Figure B.1 — Warning sign. 66
Figure C.1 — Guidance values for the rail potential gradient measured at the mast in a right angle
to the track in an a.c. traction system . 67
Figure D.1 — Equivalent circuit for the calculation of the permissible touch voltage . 71
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SIST EN 50122-1:2011
EN 50122-1:2011 – 6 –
Tables
Table 1 — Maximum dimensions for small conductive parts . 44
Table 2 — Kinds of auxiliary supplies . 47
Table 3 — Maximum permissible body voltages U in a.c. traction systems as a function of time
b, max
duration . 56
Table 4 — Maximum permissible effective touch voltages U in a.c. traction systems as a
te, max
function of time duration . 57
Table 5 — Maximum permissible body voltages U in d.c. traction systems as a function of time
b, max
duration . 59
Table 6 — Maximum permissible effective touch voltages U in d.c. traction systems as a
te, max
function of time duration . 60
Table C.1 – Guidance values for the rail potential gradient (see Figure C.1) . 68
Table D.1 — Body impedance Z and body current I . 70
b b
Table D.2 — Example of the maximum permissible prospective touch voltage for a.c. railways for
short-term conditions and R = 1 150 Ω . 72
a
Table D.3 — Body currents, body voltages and touch voltages as function of time duration in a.c.
traction systems . 73
Table D.4 — Body currents, body voltages and touch voltages as function of time duration in d.c.
traction systems . 74
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SIST EN 50122-1:2011
– 7 – EN 50122-1:2011
1 Scope
This European Standard specifies requirements for the protective provisions relating to electrical safety in
fixed installations associated with a.c. and/or d.c. traction systems and to any installations that can be
endangered by the traction power supply system.
It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during
maintenance work within electric traction systems.
This European Standard applies to all new lines and to all major revisions to existing lines for the following
electric traction systems:
a) railways;
b) guided mass transport systems such as
1) tramways,
2) elevated and underground railways,
3) mountain railways,
4) trolleybus systems, and
5) magnetically levitated systems, which use a contact line system,
c) material transportation systems.
This European Standard does not apply to:
d) mine traction systems in underground mines;
e) cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g.
exhibition structures) in so far as these are not supplied directly or via transformers from the contact line
system and are not endangered by the traction power supply system;
f) suspended cable cars;
g) funicular railways.
This European Standard does not specify working rules for maintenance.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 50119:2009, Railway applications – Fixed installations – Electric traction overhead contact lines
EN 50122-2, Railway applications – Fixed installations – Part 2: Protective provisions against the effects of
stray currents caused by d.c. traction systems
EN 50124-1:2001 + A1:2003 + A2:2005, Railway applications – Insulation coordination – Part 1: Basic
requirements – Clearances and creepage distances for all electrical and electronic equipment
EN 50153:2002, Railway applications – Rolling stock – Protective provisions relating to electrical hazards
EN 50163, Railway applications – Supply voltages of traction systems
EN 60529:1991 + A1:2000, Degrees of protection provided by enclosures (IP code)
(IEC 60529:1989 + A1:1999)
EN 60898-1:2003 + A11:2005, Electrical accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 1: Circuit-breakers for a.c. operation (IEC 60898-1:2002, mod.)
EN 61140:2002 + A1:2006, Protection against electric shock – Common aspects for installation and
equipment (IEC 61140:2001 + A1:2004, mod.)
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SIST EN 50122-1:2011
EN 50122-1:2011 – 8 –
HD 60364-4-41:2007, Low-voltage electrical installations – Part 4-41: Protection for safety – Protection
against electric shock (IEC 60364-4-41:2005, mod.)
HD 637 S1:1999, Power installations exceeding 1 kV a.c.
IEC 60050-101, International Electrotechnical Vocabulary – Chapter 101: Mathematics
IEC 60050-111, International Electrotechnical Vocabulary – Chapter 111: Physics and chemistry
IEC 60050-191, International Electrotechnical Vocabulary – Chapter 191: Dependability and quality of
service
IEC 60050-195, International Electrotechnical Vocabulary – Chapter 195: Earthing and protection against
electric shock
IEC 60050-442, International Electrotechnical Vocabulary – Chapter 442: Electrical accessories
IEC 60050-811, International Electrotechnical Vocabulary – Chapter 811: Electric traction
IEC 60050-821, International Electrotechnical Vocabulary – Chapter 821: Signalling and security apparatus
for railways
IEC 60050-826, International Electrotechnical Vocabulary – Chapter 826: Electrical installations
IEC/TS 60479-1:2005, Effects of current on human beings and livestock – Part 1: General aspects
ISO 3864-1:2002, Graphical symbols – Safety colours and safety signs – Part 1: Design principles for safety
signs in workplaces and public areas
ISO 7010:2003 + A1:2006, Graphical symbols – Safety colours and safety signs – Safety signs used in
workplaces and public areas
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Electrical safety and hazards
3.1.1
electrical safety
freedom from unacceptable risk of harm caused by electrical systems
3.1.2
electric shock
pathophysiological effect resulting from an electric current passing through a human or animal body
[IEC 60050-826-12-01]
3.1.3
(effective) touch voltage (U )
te
voltage between conductive parts when touched simultaneously by a person or an animal
NOTE 1 The value of the effective touch voltage can be appreciably influenced by the impedance of the person or the animal in electric
contact with these conductive parts
[IEC 60050-195-05-11]
NOTE 2 The c
...
SLOVENSKI STANDARD
oSIST prEN 50122-1:2008
01-julij-2008
1DGRPHãþD
SIST EN 50122-1:1998
äHOH]QLãNHQDSUDYH6WDELOQHQDSUDYHHOHNWULþQHYOHNH±(OHNWULþQDYDUQRVW
R]HPOMLWHYLQSRYH]RYDQMHGHO =DãþLWQLXNUHSLSURWLHOHNWULþQHPXXGDUX
Railway applications - Fixed installations - Electrical safety, earthing and bonding -- Part
1: Protective provisions against electric shock
Bahnanwendungen - Ortsfeste Anlagen - Elektrische Sicherheit, Erdung und
Rückstromführung -- Teil 1: Schutzmaßnahmen gegen elektrischen Schlag
Applications ferroviaires - Installations fixes - Sécurité électrique, dispositions pour les
courants de retour et mise à la terre -- Partie 1: Mesures de protection contres les chocs
électriques
Ta slovenski standard je istoveten z: FprEN 50122-1:200X
ICS:
13.260 9DUVWYRSUHGHOHNWULþQLP Protection against electric
XGDURP'HORSRGQDSHWRVWMR shock. Live working
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
45.020 Železniška tehnika na Railway engineering in
splošno general
oSIST prEN 50122-1:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50122-1:2008
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oSIST prEN 50122-1:2008
DRAFT
EUROPEAN STANDARD
prEN 50122-1
NORME EUROPÉENNE
April 2008
EUROPÄISCHE NORM
ICS Will supersede EN 50122-1:1997
English version
Railway applications -
Fixed installations -
Electrical safety, earthing and bonding -
Part 1: Protective provisions against electric shock
Applications ferroviaires - Bahnanwendungen -
Installations fixes - Ortsfeste Anlagen -
Sécurité électrique, dispositions pour les Elektrische Sicherheit, Erdung und
courants de retour et mise à la terre - Rückstromführung -
Partie 1: Mesures de protection contres Teil 1: Schutzmaßnahmen gegen
les chocs électriques elektrischen Schlag
This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2008-09-26.
It has been drawn up by CLC/SC 9XC.
If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national
standard without any alteration.
This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own
language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to
change without notice and shall not be referred to as a European Standard.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 16589 Ref. No. prEN 50122-1:2008 E
Draft for Enquiry
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oSIST prEN 50122-1:2008
prEN 50122-1:2008 – 2 –
1 Foreword
2 This draft European Standard was prepared by SC 9XC, Electric supply and earthing systems for public
3 transport equipment and ancillary apparatus (Fixed installations), of Technical Committee CENELEC TC 9X,
4 Electrical and electronic applications for railways. It is submitted to the CENELEC enquiry.
5 This document will supersede EN 50122-1:1997.
6 This draft European Standard has been prepared under a mandate given to CENELEC by the European
7 Commission and the European Free Trade Association and covers essential requirements of EC Directives
8 96/48/EC and 2001/16/EC.
9 ______________
10
Draft for Enquiry
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oSIST prEN 50122-1:2008
– 3 – prEN 50122-1:2008
11 Contents
12 1 Scope . 7
13 2 Normative references . 7
14 3 Terms and definitions . 8
15 3.1 Electrical safety and hazards . 8
16 3.2 Earthing and equipotential bonding . 11
17 3.3 Return circuit . 12
18 3.4 Electric traction system . 13
19 3.5 Contact line . 14
20 3.6 Corrosion and corrosion protection . 17
21 3.7 Current collection . 17
22 3.8 General terms . 17
23 4 Electrical zones . 18
24 4.1 Overhead contact line zone and current collector zone . 18
25 4.2 Conductor rail systems . 21
26 4.3 Overhead contact line zone and current collector zone for trolleybus system s . 21
27 5 Protective provisions against direct contact. 23
28 5.1 General . 23
29 5.2 Protection by clearance . 23
30 5.3 Protection by obstacles . 26
31 5.4 Protective provisions for work under live conditions for low voltage . 36
32 5.5 Specific protective provisions against electric shock in conductor rail systems . 39
33 5.6 Specific protective provisions against electric shock in systems in which the vehicles wheels
34 are not used for return circuit . 43
35 6 Protective provisions in case of indirect contact and rail potential . 44
36 6.1 General . 44
37 6.2 Protective provisions for exposed conductive parts . 44
38 6.3 Protective provisions for wholly or partially conductive structures . 46
39 6.4 Limitation of rail potentials . 47
40 7 Protective provisions for low voltage non traction power supplies . 48
41 7.1 General . 48
42 7.2 Related provisions . 48
43 7.3 Protective provisions for electrical installations in the overhead contact line zone or the
44 current collector zone . 48
45 7.4 Protective provisions for installations which are endangered by the traction power supply
46 return circuit . 49
47 8 Protective provisions where track systems, which are utilized for carrying traction return
48 current, or/and contact line systems pass through hazardous zones . 55
49 8.1 General . 55
50 8.2 Equipotential bonding . 56
51 8.3 Parallel return conductor . 56
52 8.4 Insulating joints . 57
53 8.5 Surge arrester . 57
54 8.6 Contact line of loading sidings . 57
55 9 Limits for touch voltage and protection against the danger of rail potential . 58
56 9.1 General . 58
57 9.2 A.C. traction systems . 59
Draft for Enquiry
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oSIST prEN 50122-1:2008
prEN 50122-1:2008 – 4 –
58 9.3 D.C. traction systems . 61
59 10 Additional aspects . 63
60 10.1 Substations and switching stations . 63
61 10.2 Protective provisions for cables against the danger of the traction power supply system . 64
62 10.3 Return circuit connections and earthing conductors . 64
63 10.4 Removing of decommissioned overhead contact lines . 65
64 10.5 Means of achieving safe isolation . 65
65 Annex A (informative) Typical obstacles . 67
66 Annex B (informative) Warning sign . 69
67 Annex C (informative) Guiding values for rail potential gradient . 70
68 C.1 A.C. traction systems . 70
69 C.2 D.C. traction systems . 71
70 Annex D (informative) Touch voltage and body voltage with respect to the body current . 72
71 D.1 Preconditions for the calculation . 72
72 D.2 Impedances . 72
73 D.3 Body current and related body voltage . 75
74 Annex E (normative) Measurement methods for (effective) touch voltages . 78
75 Annex F (normative) Use of voltage-limiting devices . 79
76 F.1 General . 79
77 F.2 Purposes for which a voltage-limiting device is used . 79
78 F.3 Compliance with the limits on touch voltage . 79
79 F.4 Current ratings . 79
80 F.5 Monitoring . 80
81 F.6 Hazards from the opening of a voltage-limiting device . 80
82 F.7 Provisions for maintenance of voltage-limiting devices . 80
83 Bibliography . 81
84
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85 Figures
86 Figure 1 – Overhead contact line zone and current collector zone . 20
87 Figure 2 – Overhead contact line zone and current collector zone for trolley bus systems . 22
88 Figure 3 – Minimum clearances to accessible live parts on the outside of vehicles as well as to live parts
89 of overhead contact line systems from standing surfaces accessible to persons for low voltages . 24
90 Figure 4 – Minimum clearances to accessible live parts on the outside of vehicles as well as to live parts
91 of overhead contact line systems from standing surfaces accessible to persons for high voltages . 25
92 Figure 5 – Standing surfaces for persons providing access to live parts on the outside of vehicles and to
93 overhead contact line systems . 27
94 Figure 6 – Standing surfaces for persons providing access to live parts on the outside of vehicles and to
95 conductor rail systems . 27
96 Figure 7 – Examples of obstacles for standing surfaces in public areas for protection against direct
97 contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact line
98 system . 29
99 Figure 8 – Examples of obstacles for standing surfaces in restricted areas for protection against direct
100 contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact line
101 system for low voltages . 32
102 Figure 9 —Examples of obstacles for standing surfaces in restricted areas for protection against direct
103 contact with adjacent live parts on the outside of vehicles or adjacent live parts of a contact line
104 system for high voltages . 33
105 Figure 10 – Examples of obstacles for standing surfaces in restricted areas for protection against direct
106 contact when above live parts on the outside of vehicles or live parts of a contact line system for
107 low voltage . 35
108 Figure 11 – Examples of obstacles for standing surfaces in restricted areas for protection against direct
109 contact when above live parts on the outside of vehicles or live parts of an overhead contact line
110 system for high voltage . 36
111 Figure 12 – Example of an insulated obstacle beneath a structure . 37
112 Figure 13 – Example of an insulated obstacle beneath a structure for an unearthed trolley bus system . 38
113 Figure 14 – Example of an insulated obstacle beneath a structure for a trolley bus system in which the
114 negative contact wire is earthed or connected to the return circuit of a tramway system . 39
115 Figure 15 – Public level crossing, private level crossing . 40
116 Figure 16 – Trackside structures . 41
117 Figure 17 – Signal-post with telephone . 41
118 Figure 18 – Authorized trackside walking route . 42
119 Figure 19 – Railway controlled crossing (depots, goods yard, station crossing) . 42
120 Figure 20 – TT system for a.c. railways . 52
121 Figure 21 – TN system for a.c. railways . 53
122 Figure 22 – TT system for d.c. railways . 54
123 Figure 23 – TN system for d.c. railways . 55
124 Figure 24 – Disposition of rail–to–rail cross bonds and track–to–track cross bonds (double–rail
125 illustration) and connection of the contact line in case of the loading siding having a contact line. 56
126 Figure 25 – Location of a surge arrester outside the overhead contact line zone of a loading siding if
127 there is a possibility of flashovers of the insulating pieces through lightning strikes. 57
128 Figure 26 – Design of return circuit, with regard to permissible touch voltage by checking the rail
129 potential or the touch voltage . 61
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130 Figure A.1 – Examples of obstacles along the sides of standing surfaces in public areas for protection
131 against direct contact when above live parts on the outside of vehicles or live parts of an overhead
132 contact line system for low voltages (see 5.3.2.2). 67
133 Figure A.2 – Examples of obstacles along the sides of standing surfaces in public areas for protection
134 against direct contact when above live parts on the outside of vehicles or live parts of an overhead
135 contact line system for high voltages (see 5.3.2.2) . 68
136 Figure B.1 – Warning sign . 69
137 Figure C.1 – Guidance values for the rail potential gradient measured at right angle away from the track
138 in an a.c. traction system . 70
139 Figure D.1 – Scheme of touching circuit . 74
140
141 Tables
142 Table 1 – Maximum dimensions for small conductive parts . 46
143 Table 2 – Kinds of auxiliary supplies . 50
144 Table 3 – Maximum permissible body voltages U in a.c. traction systems . 59
b, max
145 Table 4 – Maximum permissible touch voltages U in a.c. traction systems as a function of fault
te, max
146 duration . 60
147 Table 5 – Maximum permissible body voltages U in d.c. traction systems . 62
b, max
148 Table 6 – Maximum permissible touch voltages U in d.c. traction systems as a function of fault
te, max
149 duration . 63
150 Table C.1 – Guidance values for the rail potential gradient (see Figure C.1) . 71
151 Table D.1 – Body impedance Z and body current I . 73
B B
152 Table D.2 – Example of the prospective touch voltage under fault conditions and R = 1 150 Ω . 75
a
153 Table D.3 – Body currents and body and touch voltages as function of time duration in a.c. traction
154 systems. 76
155 Table D.4 – Body currents and body and touch voltages as function of time duration in d.c. traction
156 systems. 77
157
158
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159 1 Scope
160 This European Standard specifies requirements for the protective provisions relating to electrical safety in
161 fixed installations associated with a.c. and/or d.c. traction systems and to any installations that may be
162 endangered by the traction power supply system.
163 It also applies to all aspects of fixed installations that are necessary to ensure electrical safety during
164 maintenance work within electric traction systems.
165 This European Standard applies to all new lines and to all major revisions to existing lines for the following
166 electric traction systems:
167 – railways;
168 – guided mass transport systems such as:
169 – tramways,
170 – elevated and underground railways,
171 – mountain railways,
172 – trolleybus systems and
173 – magnetic levitated systems;
174 – material transportation systems.
175 This European Standard does not apply to:
176 – mine traction systems in underground mines;
177 – cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g.
178 exhibition structures) in so far as these are not supplied directly or via transformers from the contact line
179 system and are not endangered by the traction power supply system;
180 – suspended cable cars;
181 – funicular railways.
182 This European Standard does not specify working rules for maintenance.
183 2 Normative references
184 The following referenced documents are indispensable for the application of this document. For dated
185 references, only the edition cited applies. For undated references, the latest edition of the referenced
186 document (including any amendments) applies.
187 EN 50119:2001, Railway applications – Fixed installations – Electric traction overhead contact lines
1)
188 EN 50122-2 , Railway applications – Fixed installations – Electrical safety, earthing and bonding – Part 2:
189 Provisions against the effects of stray currents caused by d.c. traction systems
1)
190 EN 50122-3 , Railway applications – Fixed installations – Electrical safety, earthing and bonding – Part 3:
191 Mutual interaction of a.c. and d.c. traction systems
192 EN 50124-1:2001 + A1:2003 + A2:2005, Railway applications – Insulation coordination – Part 1: Basic
193 requirements – Clearances and creepage distances for all electrical and electronic equipment
194 EN 50153:2002, Railway applications – Rolling stock – Protective provisions relating to electrical hazards
1)
At draft stage.
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195 EN 50163, Railway applications – Supply voltages of traction systems
196 EN 60529:1991 + A1:2000, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989 +
197 A1:1999)
198 EN 60898-1:2003+ A11:2005, Electrical accessories – Circuit breakers for overcurrent protection for
199 household and similar installations – Part 1: Circuit-breakers for a.c. operation (IEC 60898-1:2002, mod.)
200 EN 61140:2002, Protection against electric shock – Common aspects for installation and equipment
201 (IEC 61140:2001)
2)
202 HD 384.4.41 S2:1996 + A1:2002 , Electrical installations of buildings – Part 4: Protection for safety –
203 Chapter 41: Protection against electric shock (IEC 60364-4-41:1992 + A2:1999, mod.)
204 HD 637 S1:1999, Power installations exceeding 1 kV a.c.
205 IEC 60050-101, International Electrotechnical Vocabulary – Part 101: Mathematics
206 IEC 60050-111, International Electrotechnical Vocabulary – Chapter 111: Physics and chemistry
207 IEC 60050-151, International Electrotechnical Vocabulary – Part 151: Electrical and magnetic devices
208 IEC 60050-191, International Electrotechnical Vocabulary – Chapter 191: Dependability and quality of service
209 IEC 60050-195, International Electrotechnical Vocabulary – Part 195: Earthing and protection against electric
210 shock
211 IEC 60050-466, International Electrotechnical Vocabulary – Chapter 466: Overhead lines
212 IEC 60050-811, International Electrotechnical Vocabulary – Chapter 811: Electric traction
213 IEC 60050-821, International Electrotechnical Vocabulary – Part 821: Signalling and security apparatus for
214 railways
215 IEC 60050-826, International Electrotechnical Vocabulary – Part 826: Electrical installations
216 ISO 3864 (all parts), Graphical symbols – Safety colours and safety signs
217 3 Terms and definitions
218 For the purposes of this document, the following terms and definitions apply.
219 3.1 Electrical safety and hazards
220 3.1.1
221 electrical safety
222 freedom from unacceptable risk of harm caused by electrical systems
223 3.1.2
224 electric shock
225 pathophysiological effect resulting from an electric current passing through a human or animal body
226 [IEC 60050-826-03-04]
2)
Superseded by HD 60364-4-41:2007, Low-voltage electrical installations -- Part 4-41: Protection for safety - Protection against
electric shock (IEC 60364-4-41:2005, mod.)
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227 3.1.3
228 (effective) touch voltage (U )
te
229 voltage between conductive parts when touched simultaneously by a person or an animal
230 NOT
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